includes/specials/SpecialUndelete.php

   1 <?php
   2 /**
   3  * Implements Special:Undelete
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Used to show archived pages and eventually restore them.
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class PageArchive {
  30
  31         /**
  32          * @var Title
  33          */
  34         protected $title;
  35         var $fileStatus;
  36
  37         function __construct( $title ) {
  38                 if( is_null( $title ) ) {
  39                         throw new MWException( __METHOD__ . ' given a null title.' );
  40                 }
  41                 $this->title = $title;
  42         }
  43
  44         /**
  45          * List all deleted pages recorded in the archive table. Returns result
  46          * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
  47          * namespace/title.
  48          *
  49          * @return ResultWrapper
  50          */
  51         public static function listAllPages() {
  52                 $dbr = wfGetDB( DB_SLAVE );
  53                 return self::listPages( $dbr, '' );
  54         }
  55
  56         /**
  57          * List deleted pages recorded in the archive table matching the
  58          * given title prefix.
  59          * Returns result wrapper with (ar_namespace, ar_title, count) fields.
  60          *
  61          * @param $prefix String: title prefix
  62          * @return ResultWrapper
  63          */
  64         public static function listPagesByPrefix( $prefix ) {
  65                 $dbr = wfGetDB( DB_SLAVE );
  66
  67                 $title = Title::newFromText( $prefix );
  68                 if( $title ) {
  69                         $ns = $title->getNamespace();
  70                         $prefix = $title->getDBkey();
  71                 } else {
  72                         // Prolly won't work too good
  73                         // @todo handle bare namespace names cleanly?
  74                         $ns = 0;
  75                 }
  76                 $conds = array(
  77                         'ar_namespace' => $ns,
  78                         'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
  79                 );
  80                 }
  81                 return self::listPages( $dbr, $conds );
  82         }
  83
  84         /**
  85          * @param $dbr DatabaseBase
  86          * @param $condition
  87          * @return bool|ResultWrapper
  88          */
  89         protected static function listPages( $dbr, $condition ) {
  90                 return $dbr->resultObject(
  91                         $dbr->select(
  92                                 array( 'archive' ),
  93                                 array(
  94                                         'ar_namespace',
  95                                         'ar_title',
  96                                         'COUNT(*) AS count'
  97                                 ),
  98                                 $condition,
  99                                 __METHOD__,
 100                                 array(
 101                                         'GROUP BY' => 'ar_namespace,ar_title',
 102                                         'ORDER BY' => 'ar_namespace,ar_title',
 103                                         'LIMIT' => 100,
 104                                 )
 105                         )
 106                 );
 107         }
 108
 109         /**
 110          * List the revisions of the given page. Returns result wrapper with
 111          * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
 112          *
 113          * @return ResultWrapper
 114          */
 115         function listRevisions() {
 116                 $dbr = wfGetDB( DB_SLAVE );
 117                 $res = $dbr->select( 'archive',
 118                         array(
 119                                 'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text',
 120                                 'ar_comment', 'ar_len', 'ar_deleted', 'ar_rev_id'
 121                         ),
 122                         array( 'ar_namespace' => $this->title->getNamespace(),
 123                                    'ar_title' => $this->title->getDBkey() ),
 124                         'PageArchive::listRevisions',
 125                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 126                 $ret = $dbr->resultObject( $res );
 127                 return $ret;
 128         }
 129
 130         /**
 131          * List the deleted file revisions for this page, if it's a file page.
 132          * Returns a result wrapper with various filearchive fields, or null
 133          * if not a file page.
 134          *
 135          * @return ResultWrapper
 136          * @todo Does this belong in Image for fuller encapsulation?
 137          */
 138         function listFiles() {
 139                 if( $this->title->getNamespace() == NS_FILE ) {
 140                         $dbr = wfGetDB( DB_SLAVE );
 141                         $res = $dbr->select( 'filearchive',
 142                                 array(
 143                                         'fa_id',
 144                                         'fa_name',
 145                                         'fa_archive_name',
 146                                         'fa_storage_key',
 147                                         'fa_storage_group',
 148                                         'fa_size',
 149                                         'fa_width',
 150                                         'fa_height',
 151                                         'fa_bits',
 152                                         'fa_metadata',
 153                                         'fa_media_type',
 154                                         'fa_major_mime',
 155                                         'fa_minor_mime',
 156                                         'fa_description',
 157                                         'fa_user',
 158                                         'fa_user_text',
 159                                         'fa_timestamp',
 160                                         'fa_deleted' ),
 161                                 array( 'fa_name' => $this->title->getDBkey() ),
 162                                 __METHOD__,
 163                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
 164                         $ret = $dbr->resultObject( $res );
 165                         return $ret;
 166                 }
 167                 return null;
 168         }
 169
 170         /**
 171          * Return a Revision object containing data for the deleted revision.
 172          * Note that the result *may* or *may not* have a null page ID.
 173          *
 174          * @param $timestamp String
 175          * @return Revision
 176          */
 177         function getRevision( $timestamp ) {
 178                 $dbr = wfGetDB( DB_SLAVE );
 179                 $row = $dbr->selectRow( 'archive',
 180                         array(
 181                                 'ar_rev_id',
 182                                 'ar_text',
 183                                 'ar_comment',
 184                                 'ar_user',
 185                                 'ar_user_text',
 186                                 'ar_timestamp',
 187                                 'ar_minor_edit',
 188                                 'ar_flags',
 189                                 'ar_text_id',
 190                                 'ar_deleted',
 191                                 'ar_len' ),
 192                         array( 'ar_namespace' => $this->title->getNamespace(),
 193                                    'ar_title' => $this->title->getDBkey(),
 194                                    'ar_timestamp' => $dbr->timestamp( $timestamp ) ),
 195                         __METHOD__ );
 196                 if( $row ) {
 197                         return Revision::newFromArchiveRow( $row, array( 'page' => $this->title->getArticleId() ) );
 198                 } else {
 199                         return null;
 200                 }
 201         }
 202
 203         /**
 204          * Return the most-previous revision, either live or deleted, against
 205          * the deleted revision given by timestamp.
 206          *
 207          * May produce unexpected results in case of history merges or other
 208          * unusual time issues.
 209          *
 210          * @param $timestamp String
 211          * @return Revision or null
 212          */
 213         function getPreviousRevision( $timestamp ) {
 214                 $dbr = wfGetDB( DB_SLAVE );
 215
 216                 // Check the previous deleted revision...
 217                 $row = $dbr->selectRow( 'archive',
 218                         'ar_timestamp',
 219                         array( 'ar_namespace' => $this->title->getNamespace(),
 220                                    'ar_title' => $this->title->getDBkey(),
 221                                    'ar_timestamp < ' .
 222                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 223                         __METHOD__,
 224                         array(
 225                                 'ORDER BY' => 'ar_timestamp DESC',
 226                                 'LIMIT' => 1 ) );
 227                 $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
 228
 229                 $row = $dbr->selectRow( array( 'page', 'revision' ),
 230                         array( 'rev_id', 'rev_timestamp' ),
 231                         array(
 232                                 'page_namespace' => $this->title->getNamespace(),
 233                                 'page_title' => $this->title->getDBkey(),
 234                                 'page_id = rev_page',
 235                                 'rev_timestamp < ' .
 236                                                 $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ),
 237                         __METHOD__,
 238                         array(
 239                                 'ORDER BY' => 'rev_timestamp DESC',
 240                                 'LIMIT' => 1 ) );
 241                 $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
 242                 $prevLiveId = $row ? intval( $row->rev_id ) : null;
 243
 244                 if( $prevLive && $prevLive > $prevDeleted ) {
 245                         // Most prior revision was live
 246                         return Revision::newFromId( $prevLiveId );
 247                 } elseif( $prevDeleted ) {
 248                         // Most prior revision was deleted
 249                         return $this->getRevision( $prevDeleted );
 250                 } else {
 251                         // No prior revision on this page.
 252                         return null;
 253                 }
 254         }
 255
 256         /**
 257          * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
 258          *
 259          * @param $row Object: database row
 260          * @return Revision
 261          */
 262         function getTextFromRow( $row ) {
 263                 if( is_null( $row->ar_text_id ) ) {
 264                         // An old row from MediaWiki 1.4 or previous.
 265                         // Text is embedded in this row in classic compression format.
 266                         return Revision::getRevisionText( $row, 'ar_' );
 267                 } else {
 268                         // New-style: keyed to the text storage backend.
 269                         $dbr = wfGetDB( DB_SLAVE );
 270                         $text = $dbr->selectRow( 'text',
 271                                 array( 'old_text', 'old_flags' ),
 272                                 array( 'old_id' => $row->ar_text_id ),
 273                                 __METHOD__ );
 274                         return Revision::getRevisionText( $text );
 275                 }
 276         }
 277
 278         /**
 279          * Fetch (and decompress if necessary) the stored text of the most
 280          * recently edited deleted revision of the page.
 281          *
 282          * If there are no archived revisions for the page, returns NULL.
 283          *
 284          * @return String
 285          */
 286         function getLastRevisionText() {
 287                 $dbr = wfGetDB( DB_SLAVE );
 288                 $row = $dbr->selectRow( 'archive',
 289                         array( 'ar_text', 'ar_flags', 'ar_text_id' ),
 290                         array( 'ar_namespace' => $this->title->getNamespace(),
 291                                    'ar_title' => $this->title->getDBkey() ),
 292                         __METHOD__,
 293                         array( 'ORDER BY' => 'ar_timestamp DESC' ) );
 294                 if( $row ) {
 295                         return $this->getTextFromRow( $row );
 296                 } else {
 297                         return null;
 298                 }
 299         }
 300
 301         /**
 302          * Quick check if any archived revisions are present for the page.
 303          *
 304          * @return Boolean
 305          */
 306         function isDeleted() {
 307                 $dbr = wfGetDB( DB_SLAVE );
 308                 $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
 309                         array( 'ar_namespace' => $this->title->getNamespace(),
 310                                    'ar_title' => $this->title->getDBkey() ) );
 311                 return ( $n > 0 );
 312         }
 313
 314         /**
 315          * Restore the given (or all) text and file revisions for the page.
 316          * Once restored, the items will be removed from the archive tables.
 317          * The deletion log will be updated with an undeletion notice.
 318          *
 319          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 320          * @param $comment String
 321          * @param $fileVersions Array
 322          * @param $unsuppress Boolean
 323          *
 324          * @return array(number of file revisions restored, number of image revisions restored, log message)
 325          * on success, false on failure
 326          */
 327         function undelete( $timestamps, $comment = '', $fileVersions = array(), $unsuppress = false ) {
 328                 // If both the set of text revisions and file revisions are empty,
 329                 // restore everything. Otherwise, just restore the requested items.
 330                 $restoreAll = empty( $timestamps ) && empty( $fileVersions );
 331
 332                 $restoreText = $restoreAll || !empty( $timestamps );
 333                 $restoreFiles = $restoreAll || !empty( $fileVersions );
 334
 335                 if( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
 336                         $img = wfLocalFile( $this->title );
 337                         $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
 338                         if ( !$this->fileStatus->isOk() ) {
 339                                 return false;
 340                         }
 341                         $filesRestored = $this->fileStatus->successCount;
 342                 } else {
 343                         $filesRestored = 0;
 344                 }
 345
 346                 if( $restoreText ) {
 347                         $textRestored = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
 348                         if( $textRestored === false ) { // It must be one of UNDELETE_*
 349                                 return false;
 350                         }
 351                 } else {
 352                         $textRestored = 0;
 353                 }
 354
 355                 // Touch the log!
 356                 global $wgContLang;
 357                 $log = new LogPage( 'delete' );
 358
 359                 if( $textRestored && $filesRestored ) {
 360                         $reason = wfMsgExt( 'undeletedrevisions-files', array( 'content', 'parsemag' ),
 361                                 $wgContLang->formatNum( $textRestored ),
 362                                 $wgContLang->formatNum( $filesRestored ) );
 363                 } elseif( $textRestored ) {
 364                         $reason = wfMsgExt( 'undeletedrevisions', array( 'content', 'parsemag' ),
 365                                 $wgContLang->formatNum( $textRestored ) );
 366                 } elseif( $filesRestored ) {
 367                         $reason = wfMsgExt( 'undeletedfiles', array( 'content', 'parsemag' ),
 368                                 $wgContLang->formatNum( $filesRestored ) );
 369                 } else {
 370                         wfDebug( "Undelete: nothing undeleted...\n" );
 371                         return false;
 372                 }
 373
 374                 if( trim( $comment ) != '' ) {
 375                         $reason .= wfMsgForContent( 'colon-separator' ) . $comment;
 376                 }
 377                 $log->addEntry( 'restore', $this->title, $reason );
 378
 379                 return array( $textRestored, $filesRestored, $reason );
 380         }
 381
 382         /**
 383          * This is the meaty bit -- restores archived revisions of the given page
 384          * to the cur/old tables. If the page currently exists, all revisions will
 385          * be stuffed into old, otherwise the most recent will go into cur.
 386          *
 387          * @param $timestamps Array: pass an empty array to restore all revisions, otherwise list the ones to undelete.
 388          * @param $comment String
 389          * @param $unsuppress Boolean: remove all ar_deleted/fa_deleted restrictions of seletected revs
 390          *
 391          * @return Mixed: number of revisions restored or false on failure
 392          */
 393         private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
 394                 if ( wfReadOnly() ) {
 395                         return false;
 396                 }
 397                 $restoreAll = empty( $timestamps );
 398
 399                 $dbw = wfGetDB( DB_MASTER );
 400
 401                 # Does this page already exist? We'll have to update it...
 402                 $article = new Article( $this->title );
 403                 $options = 'FOR UPDATE'; // lock page
 404                 $page = $dbw->selectRow( 'page',
 405                         array( 'page_id', 'page_latest' ),
 406                         array( 'page_namespace' => $this->title->getNamespace(),
 407                                    'page_title'     => $this->title->getDBkey() ),
 408                         __METHOD__,
 409                         $options
 410                 );
 411                 if( $page ) {
 412                         $makepage = false;
 413                         # Page already exists. Import the history, and if necessary
 414                         # we'll update the latest revision field in the record.
 415                         $newid             = 0;
 416                         $pageId            = $page->page_id;
 417                         $previousRevId    = $page->page_latest;
 418                         # Get the time span of this page
 419                         $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
 420                                 array( 'rev_id' => $previousRevId ),
 421                                 __METHOD__ );
 422                         if( $previousTimestamp === false ) {
 423                                 wfDebug( __METHOD__.": existing page refers to a page_latest that does not exist\n" );
 424                                 return 0;
 425                         }
 426                 } else {
 427                         # Have to create a new article...
 428                         $makepage = true;
 429                         $previousRevId = 0;
 430                         $previousTimestamp = 0;
 431                 }
 432
 433                 if( $restoreAll ) {
 434                         $oldones = '1 = 1'; # All revisions...
 435                 } else {
 436                         $oldts = implode( ',',
 437                                 array_map( array( &$dbw, 'addQuotes' ),
 438                                         array_map( array( &$dbw, 'timestamp' ),
 439                                                 $timestamps ) ) );
 440
 441                         $oldones = "ar_timestamp IN ( {$oldts} )";
 442                 }
 443
 444                 /**
 445                  * Select each archived revision...
 446                  */
 447                 $result = $dbw->select( 'archive',
 448                         /* fields */ array(
 449                                 'ar_rev_id',
 450                                 'ar_text',
 451                                 'ar_comment',
 452                                 'ar_user',
 453                                 'ar_user_text',
 454                                 'ar_timestamp',
 455                                 'ar_minor_edit',
 456                                 'ar_flags',
 457                                 'ar_text_id',
 458                                 'ar_deleted',
 459                                 'ar_page_id',
 460                                 'ar_len' ),
 461                         /* WHERE */ array(
 462                                 'ar_namespace' => $this->title->getNamespace(),
 463                                 'ar_title'     => $this->title->getDBkey(),
 464                                 $oldones ),
 465                         __METHOD__,
 466                         /* options */ array( 'ORDER BY' => 'ar_timestamp' )
 467                 );
 468                 $ret = $dbw->resultObject( $result );
 469                 $rev_count = $dbw->numRows( $result );
 470                 if( !$rev_count ) {
 471                         wfDebug( __METHOD__ . ": no revisions to restore\n" );
 472                         return false; // ???
 473                 }
 474
 475                 $ret->seek( $rev_count - 1 ); // move to last
 476                 $row = $ret->fetchObject(); // get newest archived rev
 477                 $ret->seek( 0 ); // move back
 478
 479                 if( $makepage ) {
 480                         // Check the state of the newest to-be version...
 481                         if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 482                                 return false; // we can't leave the current revision like this!
 483                         }
 484                         // Safe to insert now...
 485                         $newid  = $article->insertOn( $dbw );
 486                         $pageId = $newid;
 487                 } else {
 488                         // Check if a deleted revision will become the current revision...
 489                         if( $row->ar_timestamp > $previousTimestamp ) {
 490                                 // Check the state of the newest to-be version...
 491                                 if( !$unsuppress && ( $row->ar_deleted & Revision::DELETED_TEXT ) ) {
 492                                         return false; // we can't leave the current revision like this!
 493                                 }
 494                         }
 495                 }
 496
 497                 $revision = null;
 498                 $restored = 0;
 499
 500                 foreach ( $ret as $row ) {
 501                         // Check for key dupes due to shitty archive integrity.
 502                         if( $row->ar_rev_id ) {
 503                                 $exists = $dbw->selectField( 'revision', '1',
 504                                         array( 'rev_id' => $row->ar_rev_id ), __METHOD__ );
 505                                 if( $exists ) {
 506                                         continue; // don't throw DB errors
 507                                 }
 508                         }
 509                         // Insert one revision at a time...maintaining deletion status
 510                         // unless we are specifically removing all restrictions...
 511                         $revision = Revision::newFromArchiveRow( $row,
 512                                 array(
 513                                         'page' => $pageId,
 514                                         'deleted' => $unsuppress ? 0 : $row->ar_deleted
 515                                 ) );
 516
 517                         $revision->insertOn( $dbw );
 518                         $restored++;
 519
 520                         wfRunHooks( 'ArticleRevisionUndeleted', array( &$this->title, $revision, $row->ar_page_id ) );
 521                 }
 522                 # Now that it's safely stored, take it out of the archive
 523                 $dbw->delete( 'archive',
 524                         /* WHERE */ array(
 525                                 'ar_namespace' => $this->title->getNamespace(),
 526                                 'ar_title' => $this->title->getDBkey(),
 527                                 $oldones ),
 528                         __METHOD__ );
 529
 530                 // Was anything restored at all?
 531                 if ( $restored == 0 ) {
 532                         return 0;
 533                 }
 534
 535                 $created = (bool)$newid;
 536                 $oldcountable = $article->isCountable();
 537
 538                 // Attach the latest revision to the page...
 539                 $wasnew = $article->updateIfNewerOn( $dbw, $revision, $previousRevId );
 540                 if ( $created || $wasnew ) {
 541                         // Update site stats, link tables, etc
 542                         $user = User::newFromName( $revision->getRawUserText(), false );
 543                         $article->doEditUpdates( $revision, $user, array( 'created' => $created, 'oldcountable' => $oldcountable ) );
 544                 }
 545
 546                 wfRunHooks( 'ArticleUndelete', array( &$this->title, $created, $comment ) );
 547
 548                 if( $this->title->getNamespace() == NS_FILE ) {
 549                         $update = new HTMLCacheUpdate( $this->title, 'imagelinks' );
 550                         $update->doUpdate();
 551                 }
 552
 553                 return $restored;
 554         }
 555
 556         /**
 557          * @return Status
 558          */
 559         function getFileStatus() { return $this->fileStatus; }
 560 }
 561
 562 /**
 563  * Special page allowing users with the appropriate permissions to view
 564  * and restore deleted content.
 565  *
 566  * @ingroup SpecialPage
 567  */
 568 class SpecialUndelete extends SpecialPage {
 569         var $mAction, $mTarget, $mTimestamp, $mRestore, $mInvert, $mFilename;
 570         var $mTargetTimestamp, $mAllowed, $mCanView, $mComment, $mToken;
 571
 572         /**
 573          * @var Title
 574          */
 575         var $mTargetObj;
 576
 577         function __construct() {
 578                 parent::__construct( 'Undelete', 'deletedhistory' );
 579         }
 580
 581         function loadRequest() {
 582                 $request = $this->getRequest();
 583                 $user = $this->getUser();
 584
 585                 $this->mAction = $request->getVal( 'action' );
 586                 $this->mTarget = $request->getVal( 'target' );
 587                 $this->mSearchPrefix = $request->getText( 'prefix' );
 588                 $time = $request->getVal( 'timestamp' );
 589                 $this->mTimestamp = $time ? wfTimestamp( TS_MW, $time ) : '';
 590                 $this->mFilename = $request->getVal( 'file' );
 591
 592                 $posted = $request->wasPosted() &&
 593                         $user->matchEditToken( $request->getVal( 'wpEditToken' ) );
 594                 $this->mRestore = $request->getCheck( 'restore' ) && $posted;
 595                 $this->mInvert = $request->getCheck( 'invert' ) && $posted;
 596                 $this->mPreview = $request->getCheck( 'preview' ) && $posted;
 597                 $this->mDiff = $request->getCheck( 'diff' );
 598                 $this->mComment = $request->getText( 'wpComment' );
 599                 $this->mUnsuppress = $request->getVal( 'wpUnsuppress' ) && $user->isAllowed( 'suppressrevision' );
 600                 $this->mToken = $request->getVal( 'token' );
 601
 602                 if ( $user->isAllowed( 'undelete' ) && !$user->isBlocked() ) {
 603                         $this->mAllowed = true; // user can restore
 604                         $this->mCanView = true; // user can view content
 605                 } elseif ( $user->isAllowed( 'deletedtext' ) ) {
 606                         $this->mAllowed = false; // user cannot restore
 607                         $this->mCanView = true; // user can view content
 608                 } else { // user can only view the list of revisions
 609                         $this->mAllowed = false;
 610                         $this->mCanView = false;
 611                         $this->mTimestamp = '';
 612                         $this->mRestore = false;
 613                 }
 614
 615                 if( $this->mRestore || $this->mInvert ) {
 616                         $timestamps = array();
 617                         $this->mFileVersions = array();
 618                         foreach( $request->getValues() as $key => $val ) {
 619                                 $matches = array();
 620                                 if( preg_match( '/^ts(\d{14})$/', $key, $matches ) ) {
 621                                         array_push( $timestamps, $matches[1] );
 622                                 }
 623
 624                                 if( preg_match( '/^fileid(\d+)$/', $key, $matches ) ) {
 625                                         $this->mFileVersions[] = intval( $matches[1] );
 626                                 }
 627                         }
 628                         rsort( $timestamps );
 629                         $this->mTargetTimestamp = $timestamps;
 630                 }
 631         }
 632
 633         function execute( $par ) {
 634                 $this->setHeaders();
 635                 if ( !$this->userCanExecute( $this->getUser() ) ) {
 636                         $this->displayRestrictionError();
 637                         return;
 638                 }
 639
 640                 if ( $this->getUser()->isBlocked() ) {
 641                         throw new UserBlockedError( $this->getUser()->getBlock() );
 642                 }
 643
 644                 $this->outputHeader();
 645
 646                 $this->loadRequest();
 647
 648                 $out = $this->getOutput();
 649
 650                 if ( $this->mAllowed ) {
 651                         $out->setPageTitle( wfMsg( 'undeletepage' ) );
 652                 } else {
 653                         $out->setPageTitle( wfMsg( 'viewdeletedpage' ) );
 654                 }
 655
 656                 if( $par != '' ) {
 657                         $this->mTarget = $par;
 658                 }
 659                 if ( $this->mTarget !== '' ) {
 660                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
 661                         $this->getSkin()->setRelevantTitle( $this->mTargetObj );
 662                 } else {
 663                         $this->mTargetObj = null;
 664                 }
 665
 666                 if( is_null( $this->mTargetObj ) ) {
 667                         # Not all users can just browse every deleted page from the list
 668                         if( $this->getUser()->isAllowed( 'browsearchive' ) ) {
 669                                 $this->showSearchForm();
 670
 671                                 # List undeletable articles
 672                                 if( $this->mSearchPrefix ) {
 673                                         $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
 674                                         $this->showList( $result );
 675                                 }
 676                         } else {
 677                                 $out->addWikiMsg( 'undelete-header' );
 678                         }
 679                         return;
 680                 }
 681                 if( $this->mTimestamp !== '' ) {
 682                         return $this->showRevision( $this->mTimestamp );
 683                 }
 684                 if( $this->mFilename !== null ) {
 685                         $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 686                         // Check if user is allowed to see this file
 687                         if ( !$file->exists() ) {
 688                                 $out->addWikiMsg( 'filedelete-nofile', $this->mFilename );
 689                                 return;
 690                         } elseif( !$file->userCan( File::DELETED_FILE ) ) {
 691                                 if( $file->isDeleted( File::DELETED_RESTRICTED ) ) {
 692                                         $out->permissionRequired( 'suppressrevision' );
 693                                 } else {
 694                                         $out->permissionRequired( 'deletedtext' );
 695                                 }
 696                                 return false;
 697                         } elseif ( !$this->getUser()->matchEditToken( $this->mToken, $this->mFilename ) ) {
 698                                 $this->showFileConfirmationForm( $this->mFilename );
 699                                 return false;
 700                         } else {
 701                                 return $this->showFile( $this->mFilename );
 702                         }
 703                 }
 704                 if( $this->mRestore && $this->mAction == 'submit' ) {
 705                         global $wgUploadMaintenance;
 706                         if( $wgUploadMaintenance && $this->mTargetObj && $this->mTargetObj->getNamespace() == NS_FILE ) {
 707                                 $out->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 708                                 return;
 709                         }
 710                         return $this->undelete();
 711                 }
 712                 if( $this->mInvert && $this->mAction == 'submit' ) {
 713                         return $this->showHistory();
 714                 }
 715                 return $this->showHistory();
 716         }
 717
 718         function showSearchForm() {
 719                 global $wgScript;
 720
 721                 $this->getOutput()->addWikiMsg( 'undelete-header' );
 722
 723                 $this->getOutput()->addHTML(
 724                         Xml::openElement( 'form', array(
 725                                 'method' => 'get',
 726                                 'action' => $wgScript ) ) .
 727                         Xml::fieldset( wfMsg( 'undelete-search-box' ) ) .
 728                         Html::hidden( 'title',
 729                                 $this->getTitle()->getPrefixedDbKey() ) .
 730                         Xml::inputLabel( wfMsg( 'undelete-search-prefix' ),
 731                                 'prefix', 'prefix', 20,
 732                                 $this->mSearchPrefix ) . ' ' .
 733                         Xml::submitButton( wfMsg( 'undelete-search-submit' ) ) .
 734                         Xml::closeElement( 'fieldset' ) .
 735                         Xml::closeElement( 'form' )
 736                 );
 737         }
 738
 739         /**
 740          * Generic list of deleted pages
 741          *
 742          * @param $result ResultWrapper
 743          * @return bool
 744          */
 745         private function showList( $result ) {
 746                 $out = $this->getOutput();
 747
 748                 if( $result->numRows() == 0 ) {
 749                         $out->addWikiMsg( 'undelete-no-results' );
 750                         return;
 751                 }
 752
 753                 $out->addWikiMsg( 'undeletepagetext', $this->getLang()->formatNum( $result->numRows() ) );
 754
 755                 $undelete = $this->getTitle();
 756                 $out->addHTML( "<ul>\n" );
 757                 foreach ( $result as $row ) {
 758                         $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 759                         $link = Linker::linkKnown(
 760                                 $undelete,
 761                                 htmlspecialchars( $title->getPrefixedText() ),
 762                                 array(),
 763                                 array( 'target' => $title->getPrefixedText() )
 764                         );
 765                         $revs = wfMsgExt( 'undeleterevisions',
 766                                 array( 'parseinline' ),
 767                                 $this->getLang()->formatNum( $row->count ) );
 768                         $out->addHTML( "<li>{$link} ({$revs})</li>\n" );
 769                 }
 770                 $result->free();
 771                 $out->addHTML( "</ul>\n" );
 772
 773                 return true;
 774         }
 775
 776         private function showRevision( $timestamp ) {
 777                 $out = $this->getOutput();
 778
 779                 if( !preg_match( '/[0-9]{14}/', $timestamp ) ) {
 780                         return 0;
 781                 }
 782
 783                 $archive = new PageArchive( $this->mTargetObj );
 784                 wfRunHooks( 'UndeleteForm::showRevision', array( &$archive, $this->mTargetObj ) );
 785                 $rev = $archive->getRevision( $timestamp );
 786
 787                 if( !$rev ) {
 788                         $out->addWikiMsg( 'undeleterevision-missing' );
 789                         return;
 790                 }
 791
 792                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 793                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 794                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
 795                                 return;
 796                         } else {
 797                                 $out->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
 798                                 $out->addHTML( '<br />' );
 799                                 // and we are allowed to see...
 800                         }
 801                 }
 802
 803                 $out->setPageTitle( wfMsg( 'undeletepage' ) );
 804
 805                 if( $this->mDiff ) {
 806                         $previousRev = $archive->getPreviousRevision( $timestamp );
 807                         if( $previousRev ) {
 808                                 $this->showDiff( $previousRev, $rev );
 809                                 if( $this->getUser()->getOption( 'diffonly' ) ) {
 810                                         return;
 811                                 } else {
 812                                         $out->addHTML( '<hr />' );
 813                                 }
 814                         } else {
 815                                 $out->addWikiMsg( 'undelete-nodiff' );
 816                         }
 817                 }
 818
 819                 $link = Linker::linkKnown(
 820                         $this->getTitle( $this->mTargetObj->getPrefixedDBkey() ),
 821                         htmlspecialchars( $this->mTargetObj->getPrefixedText() )
 822                 );
 823
 824                 // date and time are separate parameters to facilitate localisation.
 825                 // $time is kept for backward compat reasons.
 826                 $time = $this->getLang()->timeAndDate( $timestamp, true );
 827                 $d = $this->getLang()->date( $timestamp, true );
 828                 $t = $this->getLang()->time( $timestamp, true );
 829                 $user = Linker::revUserTools( $rev );
 830
 831                 if( $this->mPreview ) {
 832                         $openDiv = '<div id="mw-undelete-revision" class="mw-warning">';
 833                 } else {
 834                         $openDiv = '<div id="mw-undelete-revision">';
 835                 }
 836                 $out->addHTML( $openDiv );
 837
 838                 // Revision delete links
 839                 if ( !$this->mDiff ) {
 840                         $revdel = Linker::getRevDeleteLink( $this->getUser(), $rev, $this->mTargetObj );
 841                         if ( $revdel ) {
 842                                 $out->addHTML( "$revdel " );
 843                         }
 844                 }
 845
 846                 $out->addHTML( wfMessage( 'undelete-revision' )->rawParams( $link )->params(
 847                         $time )->rawParams( $user )->params( $d, $t )->parse() . '</div>' );
 848                 wfRunHooks( 'UndeleteShowRevision', array( $this->mTargetObj, $rev ) );
 849
 850                 if( $this->mPreview ) {
 851                         // Hide [edit]s
 852                         $popts = $out->parserOptions();
 853                         $popts->setEditSection( false );
 854                         $out->parserOptions( $popts );
 855                         $out->addWikiTextTitleTidy( $rev->getText( Revision::FOR_THIS_USER ), $this->mTargetObj, true );
 856                 }
 857
 858                 $out->addHTML(
 859                         Xml::element( 'textarea', array(
 860                                         'readonly' => 'readonly',
 861                                         'cols' => intval( $this->getUser()->getOption( 'cols' ) ),
 862                                         'rows' => intval( $this->getUser()->getOption( 'rows' ) ) ),
 863                                 $rev->getText( Revision::FOR_THIS_USER ) . "\n" ) .
 864                         Xml::openElement( 'div' ) .
 865                         Xml::openElement( 'form', array(
 866                                 'method' => 'post',
 867                                 'action' => $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) ) ) ) .
 868                         Xml::element( 'input', array(
 869                                 'type' => 'hidden',
 870                                 'name' => 'target',
 871                                 'value' => $this->mTargetObj->getPrefixedDbKey() ) ) .
 872                         Xml::element( 'input', array(
 873                                 'type' => 'hidden',
 874                                 'name' => 'timestamp',
 875                                 'value' => $timestamp ) ) .
 876                         Xml::element( 'input', array(
 877                                 'type' => 'hidden',
 878                                 'name' => 'wpEditToken',
 879                                 'value' => $this->getUser()->editToken() ) ) .
 880                         Xml::element( 'input', array(
 881                                 'type' => 'submit',
 882                                 'name' => 'preview',
 883                                 'value' => wfMsg( 'showpreview' ) ) ) .
 884                         Xml::element( 'input', array(
 885                                 'name' => 'diff',
 886                                 'type' => 'submit',
 887                                 'value' => wfMsg( 'showdiff' ) ) ) .
 888                         Xml::closeElement( 'form' ) .
 889                         Xml::closeElement( 'div' ) );
 890         }
 891
 892         /**
 893          * Build a diff display between this and the previous either deleted
 894          * or non-deleted edit.
 895          *
 896          * @param $previousRev Revision
 897          * @param $currentRev Revision
 898          * @return String: HTML
 899          */
 900         function showDiff( $previousRev, $currentRev ) {
 901                 $diffEngine = new DifferenceEngine( $previousRev->getTitle() );
 902                 $diffEngine->showDiffStyle();
 903                 $this->getOutput()->addHTML(
 904                         "<div>" .
 905                         "<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" .
 906                         "<col class='diff-marker' />" .
 907                         "<col class='diff-content' />" .
 908                         "<col class='diff-marker' />" .
 909                         "<col class='diff-content' />" .
 910                         "<tr>" .
 911                                 "<td colspan='2' width='50%' align='center' class='diff-otitle'>" .
 912                                 $this->diffHeader( $previousRev, 'o' ) .
 913                                 "</td>\n" .
 914                                 "<td colspan='2' width='50%' align='center' class='diff-ntitle'>" .
 915                                 $this->diffHeader( $currentRev, 'n' ) .
 916                                 "</td>\n" .
 917                         "</tr>" .
 918                         $diffEngine->generateDiffBody(
 919                                 $previousRev->getText(), $currentRev->getText() ) .
 920                         "</table>" .
 921                         "</div>\n"
 922                 );
 923         }
 924
 925         /**
 926          * @param $rev Revision
 927          * @param $prefix
 928          * @return string
 929          */
 930         private function diffHeader( $rev, $prefix ) {
 931                 $isDeleted = !( $rev->getId() && $rev->getTitle() );
 932                 if( $isDeleted ) {
 933                         /// @todo FIXME: $rev->getTitle() is null for deleted revs...?
 934                         $targetPage = $this->getTitle();
 935                         $targetQuery = array(
 936                                 'target' => $this->mTargetObj->getPrefixedText(),
 937                                 'timestamp' => wfTimestamp( TS_MW, $rev->getTimestamp() )
 938                         );
 939                 } else {
 940                         /// @todo FIXME: getId() may return non-zero for deleted revs...
 941                         $targetPage = $rev->getTitle();
 942                         $targetQuery = array( 'oldid' => $rev->getId() );
 943                 }
 944                 // Add show/hide deletion links if available
 945                 $rdel = Linker::getRevDeleteLink( $this->getUser(), $rev, $this->mTargetObj );
 946                 if ( $rdel ) $rdel = " $rdel";
 947                 return
 948                         '<div id="mw-diff-' . $prefix . 'title1"><strong>' .
 949                                 Linker::link(
 950                                         $targetPage,
 951                                         wfMsgExt(
 952                                                 'revisionasof',
 953                                                 array( 'escape' ),
 954                                                 $this->getLang()->timeanddate( $rev->getTimestamp(), true ),
 955                                                 $this->getLang()->date( $rev->getTimestamp(), true ),
 956                                                 $this->getLang()->time( $rev->getTimestamp(), true )
 957                                         ),
 958                                         array(),
 959                                         $targetQuery
 960                                 ) .
 961                         '</strong></div>' .
 962                         '<div id="mw-diff-'.$prefix.'title2">' .
 963                                 Linker::revUserTools( $rev ) . '<br />' .
 964                         '</div>' .
 965                         '<div id="mw-diff-'.$prefix.'title3">' .
 966                                 Linker::revComment( $rev ) . $rdel . '<br />' .
 967                         '</div>';
 968         }
 969
 970         /**
 971          * Show a form confirming whether a tokenless user really wants to see a file
 972          */
 973         private function showFileConfirmationForm( $key ) {
 974                 $file = new ArchivedFile( $this->mTargetObj, '', $this->mFilename );
 975                 $this->getOutput()->addWikiMsg( 'undelete-show-file-confirm',
 976                         $this->mTargetObj->getText(),
 977                         $this->getLang()->date( $file->getTimestamp() ),
 978                         $this->getLang()->time( $file->getTimestamp() ) );
 979                 $this->getOutput()->addHTML(
 980                         Xml::openElement( 'form', array(
 981                                 'method' => 'POST',
 982                                 'action' => $this->getTitle()->getLocalURL(
 983                                         'target=' . urlencode( $this->mTarget ) .
 984                                         '&file=' . urlencode( $key ) .
 985                                         '&token=' . urlencode( $this->getUser()->editToken( $key ) ) )
 986                                 )
 987                         ) .
 988                         Xml::submitButton( wfMsg( 'undelete-show-file-submit' ) ) .
 989                         '</form>'
 990                 );
 991         }
 992
 993         /**
 994          * Show a deleted file version requested by the visitor.
 995          */
 996         private function showFile( $key ) {
 997                 $this->getOutput()->disable();
 998
 999                 # We mustn't allow the output to be Squid cached, otherwise
1000                 # if an admin previews a deleted image, and it's cached, then
1001                 # a user without appropriate permissions can toddle off and
1002                 # nab the image, and Squid will serve it
1003                 $response = $this->getRequest()->response();
1004                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1005                 $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1006                 $response->header( 'Pragma: no-cache' );
1007
1008                 $repo = RepoGroup::singleton()->getLocalRepo();
1009                 $path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
1010                 StreamFile::stream( $path );
1011         }
1012
1013         private function showHistory() {
1014                 $out = $this->getOutput();
1015                 if( $this->mAllowed ) {
1016                         $out->addModules( 'mediawiki.special.undelete' );
1017                         $out->setPageTitle( wfMsg( 'undeletepage' ) );
1018                 } else {
1019                         $out->setPageTitle( wfMsg( 'viewdeletedpage' ) );
1020                 }
1021                 $out->wrapWikiMsg(
1022                         "<div class='mw-undelete-pagetitle'>\n$1\n</div>\n",
1023                         array( 'undeletepagetitle', $this->mTargetObj->getPrefixedText() )
1024                 );
1025
1026                 $archive = new PageArchive( $this->mTargetObj );
1027                 wfRunHooks( 'UndeleteForm::showHistory', array( &$archive, $this->mTargetObj ) );
1028                 /*
1029                 $text = $archive->getLastRevisionText();
1030                 if( is_null( $text ) ) {
1031                         $out->addWikiMsg( 'nohistory' );
1032                         return;
1033                 }
1034                 */
1035                 $out->addHTML( '<div class="mw-undelete-history">' );
1036                 if ( $this->mAllowed ) {
1037                         $out->addWikiMsg( 'undeletehistory' );
1038                         $out->addWikiMsg( 'undeleterevdel' );
1039                 } else {
1040                         $out->addWikiMsg( 'undeletehistorynoadmin' );
1041                 }
1042                 $out->addHTML( '</div>' );
1043
1044                 # List all stored revisions
1045                 $revisions = $archive->listRevisions();
1046                 $files = $archive->listFiles();
1047
1048                 $haveRevisions = $revisions && $revisions->numRows() > 0;
1049                 $haveFiles = $files && $files->numRows() > 0;
1050
1051                 # Batch existence check on user and talk pages
1052                 if( $haveRevisions ) {
1053                         $batch = new LinkBatch();
1054                         foreach ( $revisions as $row ) {
1055                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->ar_user_text ) );
1056                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->ar_user_text ) );
1057                         }
1058                         $batch->execute();
1059                         $revisions->seek( 0 );
1060                 }
1061                 if( $haveFiles ) {
1062                         $batch = new LinkBatch();
1063                         foreach ( $files as $row ) {
1064                                 $batch->addObj( Title::makeTitleSafe( NS_USER, $row->fa_user_text ) );
1065                                 $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->fa_user_text ) );
1066                         }
1067                         $batch->execute();
1068                         $files->seek( 0 );
1069                 }
1070
1071                 if ( $this->mAllowed ) {
1072                         $action = $this->getTitle()->getLocalURL( array( 'action' => 'submit' ) );
1073                         # Start the form here
1074                         $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'undelete' ) );
1075                         $out->addHTML( $top );
1076                 }
1077
1078                 # Show relevant lines from the deletion log:
1079                 $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) . "\n" );
1080                 LogEventsList::showLogExtract( $out, 'delete', $this->mTargetObj->getPrefixedText() );
1081                 # Show relevant lines from the suppression log:
1082                 if( $this->getUser()->isAllowed( 'suppressionlog' ) ) {
1083                         $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'suppress' ) ) . "\n" );
1084                         LogEventsList::showLogExtract( $out, 'suppress', $this->mTargetObj->getPrefixedText() );
1085                 }
1086
1087                 if( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
1088                         # Format the user-visible controls (comment field, submission button)
1089                         # in a nice little table
1090                         if( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
1091                                 $unsuppressBox =
1092                                         "<tr>
1093                                                 <td>&#160;</td>
1094                                                 <td class='mw-input'>" .
1095                                                         Xml::checkLabel( wfMsg( 'revdelete-unsuppress' ), 'wpUnsuppress',
1096                                                                 'mw-undelete-unsuppress', $this->mUnsuppress ).
1097                                                 "</td>
1098                                         </tr>";
1099                         } else {
1100                                 $unsuppressBox = '';
1101                         }
1102                         $table =
1103                                 Xml::fieldset( wfMsg( 'undelete-fieldset-title' ) ) .
1104                                 Xml::openElement( 'table', array( 'id' => 'mw-undelete-table' ) ) .
1105                                         "<tr>
1106                                                 <td colspan='2' class='mw-undelete-extrahelp'>" .
1107                                                         wfMsgExt( 'undeleteextrahelp', 'parse' ) .
1108                                                 "</td>
1109                                         </tr>
1110                                         <tr>
1111                                                 <td class='mw-label'>" .
1112                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
1113                                                 "</td>
1114                                                 <td class='mw-input'>" .
1115                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' =>  'wpComment' ) ) .
1116                                                 "</td>
1117                                         </tr>
1118                                         <tr>
1119                                                 <td>&#160;</td>
1120                                                 <td class='mw-submit'>" .
1121                                                         Xml::submitButton( wfMsg( 'undeletebtn' ), array( 'name' => 'restore', 'id' => 'mw-undelete-submit' ) ) . ' ' .
1122                                                         Xml::submitButton( wfMsg( 'undeleteinvert' ), array( 'name' => 'invert', 'id' => 'mw-undelete-invert' ) ) .
1123                                                 "</td>
1124                                         </tr>" .
1125                                         $unsuppressBox .
1126                                 Xml::closeElement( 'table' ) .
1127                                 Xml::closeElement( 'fieldset' );
1128
1129                         $out->addHTML( $table );
1130                 }
1131
1132                 $out->addHTML( Xml::element( 'h2', null, wfMsg( 'history' ) ) . "\n" );
1133
1134                 if( $haveRevisions ) {
1135                         # The page's stored (deleted) history:
1136                         $out->addHTML( '<ul>' );
1137                         $remaining = $revisions->numRows();
1138                         $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
1139
1140                         foreach ( $revisions as $row ) {
1141                                 $remaining--;
1142                                 $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
1143                         }
1144                         $revisions->free();
1145                         $out->addHTML( '</ul>' );
1146                 } else {
1147                         $out->addWikiMsg( 'nohistory' );
1148                 }
1149
1150                 if( $haveFiles ) {
1151                         $out->addHTML( Xml::element( 'h2', null, wfMsg( 'filehist' ) ) . "\n" );
1152                         $out->addHTML( '<ul>' );
1153                         foreach ( $files as $row ) {
1154                                 $out->addHTML( $this->formatFileRow( $row ) );
1155                         }
1156                         $files->free();
1157                         $out->addHTML( '</ul>' );
1158                 }
1159
1160                 if ( $this->mAllowed ) {
1161                         # Slip in the hidden controls here
1162                         $misc  = Html::hidden( 'target', $this->mTarget );
1163                         $misc .= Html::hidden( 'wpEditToken', $this->getUser()->editToken() );
1164                         $misc .= Xml::closeElement( 'form' );
1165                         $out->addHTML( $misc );
1166                 }
1167
1168                 return true;
1169         }
1170
1171         private function formatRevisionRow( $row, $earliestLiveTime, $remaining ) {
1172                 $rev = Revision::newFromArchiveRow( $row,
1173                         array( 'page' => $this->mTargetObj->getArticleId() ) );
1174                 $stxt = '';
1175                 $ts = wfTimestamp( TS_MW, $row->ar_timestamp );
1176                 // Build checkboxen...
1177                 if( $this->mAllowed ) {
1178                         if( $this->mInvert ) {
1179                                 if( in_array( $ts, $this->mTargetTimestamp ) ) {
1180                                         $checkBox = Xml::check( "ts$ts" );
1181                                 } else {
1182                                         $checkBox = Xml::check( "ts$ts", true );
1183                                 }
1184                         } else {
1185                                 $checkBox = Xml::check( "ts$ts" );
1186                         }
1187                 } else {
1188                         $checkBox = '';
1189                 }
1190                 // Build page & diff links...
1191                 if( $this->mCanView ) {
1192                         $titleObj = $this->getTitle();
1193                         # Last link
1194                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1195                                 $pageLink = htmlspecialchars( $this->getLang()->timeanddate( $ts, true ) );
1196                                 $last = wfMsgHtml( 'diff' );
1197                         } elseif( $remaining > 0 || ( $earliestLiveTime && $ts > $earliestLiveTime ) ) {
1198                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1199                                 $last = Linker::linkKnown(
1200                                         $titleObj,
1201                                         wfMsgHtml( 'diff' ),
1202                                         array(),
1203                                         array(
1204                                                 'target' => $this->mTargetObj->getPrefixedText(),
1205                                                 'timestamp' => $ts,
1206                                                 'diff' => 'prev'
1207                                         )
1208                                 );
1209                         } else {
1210                                 $pageLink = $this->getPageLink( $rev, $titleObj, $ts );
1211                                 $last = wfMsgHtml( 'diff' );
1212                         }
1213                 } else {
1214                         $pageLink = htmlspecialchars( $this->getLang()->timeanddate( $ts, true ) );
1215                         $last = wfMsgHtml( 'diff' );
1216                 }
1217                 // User links
1218                 $userLink = Linker::revUserTools( $rev );
1219                 // Revision text size
1220                 $size = $row->ar_len;
1221                 if( !is_null( $size ) ) {
1222                         $stxt = Linker::formatRevisionSize( $size );
1223                 }
1224                 // Edit summary
1225                 $comment = Linker::revComment( $rev );
1226                 // Revision delete links
1227                 $revdlink = Linker::getRevDeleteLink( $this->getUser(), $rev, $this->mTargetObj );
1228                 return "<li>$checkBox $revdlink ($last) $pageLink . . $userLink $stxt $comment</li>";
1229         }
1230
1231         private function formatFileRow( $row ) {
1232                 $file = ArchivedFile::newFromRow( $row );
1233
1234                 $ts = wfTimestamp( TS_MW, $row->fa_timestamp );
1235                 if( $this->mAllowed && $row->fa_storage_key ) {
1236                         $checkBox = Xml::check( 'fileid' . $row->fa_id );
1237                         $key = urlencode( $row->fa_storage_key );
1238                         $pageLink = $this->getFileLink( $file, $this->getTitle(), $ts, $key );
1239                 } else {
1240                         $checkBox = '';
1241                         $pageLink = $this->getLang()->timeanddate( $ts, true );
1242                 }
1243                 $userLink = $this->getFileUser( $file );
1244                 $data =
1245                         wfMsg( 'widthheight',
1246                                 $this->getLang()->formatNum( $row->fa_width ),
1247                                 $this->getLang()->formatNum( $row->fa_height ) ) .
1248                         ' (' .
1249                         wfMsg( 'nbytes', $this->getLang()->formatNum( $row->fa_size ) ) .
1250                         ')';
1251                 $data = htmlspecialchars( $data );
1252                 $comment = $this->getFileComment( $file );
1253
1254                 // Add show/hide deletion links if available
1255                 $canHide = $this->getUser()->isAllowed( 'deleterevision' );
1256                 if( $canHide || ( $file->getVisibility() && $this->getUser()->isAllowed( 'deletedhistory' ) ) ) {
1257                         if( !$file->userCan( File::DELETED_RESTRICTED ) ) {
1258                                 $revdlink = Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
1259                         } else {
1260                                 $query = array(
1261                                         'type' => 'filearchive',
1262                                         'target' => $this->mTargetObj->getPrefixedDBkey(),
1263                                         'ids' => $row->fa_id
1264                                 );
1265                                 $revdlink = Linker::revDeleteLink( $query,
1266                                         $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1267                         }
1268                 } else {
1269                         $revdlink = '';
1270                 }
1271
1272                 return "<li>$checkBox $revdlink $pageLink . . $userLink $data $comment</li>\n";
1273         }
1274
1275         /**
1276          * Fetch revision text link if it's available to all users
1277          *
1278          * @param $rev Revision
1279          * @return string
1280          */
1281         function getPageLink( $rev, $titleObj, $ts ) {
1282                 $time = htmlspecialchars( $this->getLang()->timeanddate( $ts, true ) );
1283
1284                 if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
1285                         return '<span class="history-deleted">' . $time . '</span>';
1286                 } else {
1287                         $link = Linker::linkKnown(
1288                                 $titleObj,
1289                                 $time,
1290                                 array(),
1291                                 array(
1292                                         'target' => $this->mTargetObj->getPrefixedText(),
1293                                         'timestamp' => $ts
1294                                 )
1295                         );
1296                         if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
1297                                 $link = '<span class="history-deleted">' . $link . '</span>';
1298                         }
1299                         return $link;
1300                 }
1301         }
1302
1303         /**
1304          * Fetch image view link if it's available to all users
1305          *
1306          * @param $file File
1307          * @return String: HTML fragment
1308          */
1309         function getFileLink( $file, $titleObj, $ts, $key ) {
1310                 if( !$file->userCan( File::DELETED_FILE ) ) {
1311                         return '<span class="history-deleted">' . $this->getLang()->timeanddate( $ts, true ) . '</span>';
1312                 } else {
1313                         $link = Linker::linkKnown(
1314                                 $titleObj,
1315                                 $this->getLang()->timeanddate( $ts, true ),
1316                                 array(),
1317                                 array(
1318                                         'target' => $this->mTargetObj->getPrefixedText(),
1319                                         'file' => $key,
1320                                         'token' => $this->getUser()->editToken( $key )
1321                                 )
1322                         );
1323                         if( $file->isDeleted( File::DELETED_FILE ) ) {
1324                                 $link = '<span class="history-deleted">' . $link . '</span>';
1325                         }
1326                         return $link;
1327                 }
1328         }
1329
1330         /**
1331          * Fetch file's user id if it's available to this user
1332          *
1333          * @param $file File
1334          * @return String: HTML fragment
1335          */
1336         function getFileUser( $file ) {
1337                 if( !$file->userCan( File::DELETED_USER ) ) {
1338                         return '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1339                 } else {
1340                         $link = Linker::userLink( $file->getRawUser(), $file->getRawUserText() ) .
1341                                 Linker::userToolLinks( $file->getRawUser(), $file->getRawUserText() );
1342                         if( $file->isDeleted( File::DELETED_USER ) ) {
1343                                 $link = '<span class="history-deleted">' . $link . '</span>';
1344                         }
1345                         return $link;
1346                 }
1347         }
1348
1349         /**
1350          * Fetch file upload comment if it's available to this user
1351          *
1352          * @param $file File
1353          * @return String: HTML fragment
1354          */
1355         function getFileComment( $file ) {
1356                 if( !$file->userCan( File::DELETED_COMMENT ) ) {
1357                         return '<span class="history-deleted"><span class="comment">' .
1358                                 wfMsgHtml( 'rev-deleted-comment' ) . '</span></span>';
1359                 } else {
1360                         $link = Linker::commentBlock( $file->getRawDescription() );
1361                         if( $file->isDeleted( File::DELETED_COMMENT ) ) {
1362                                 $link = '<span class="history-deleted">' . $link . '</span>';
1363                         }
1364                         return $link;
1365                 }
1366         }
1367
1368         function undelete() {
1369                 if ( wfReadOnly() ) {
1370                         throw new ReadOnlyError;
1371                 }
1372
1373                 if( !is_null( $this->mTargetObj ) ) {
1374                         $archive = new PageArchive( $this->mTargetObj );
1375                         wfRunHooks( 'UndeleteForm::undelete', array( &$archive, $this->mTargetObj ) );
1376                         $ok = $archive->undelete(
1377                                 $this->mTargetTimestamp,
1378                                 $this->mComment,
1379                                 $this->mFileVersions,
1380                                 $this->mUnsuppress );
1381
1382                         if( is_array( $ok ) ) {
1383                                 if ( $ok[1] ) { // Undeleted file count
1384                                         wfRunHooks( 'FileUndeleteComplete', array(
1385                                                 $this->mTargetObj, $this->mFileVersions,
1386                                                 $this->getUser(), $this->mComment ) );
1387                                 }
1388
1389                                 $link = Linker::linkKnown( $this->mTargetObj );
1390                                 $this->getOutput()->addHTML( wfMessage( 'undeletedpage' )->rawParams( $link )->parse() );
1391                         } else {
1392                                 $this->getOutput()->showFatalError( wfMsg( 'cannotundelete' ) );
1393                                 $this->getOutput()->addWikiMsg( 'undeleterevdel' );
1394                         }
1395
1396                         // Show file deletion warnings and errors
1397                         $status = $archive->getFileStatus();
1398                         if( $status && !$status->isGood() ) {
1399                                 $this->getOutput()->addWikiText( $status->getWikiText( 'undelete-error-short', 'undelete-error-long' ) );
1400                         }
1401                 } else {
1402                         $this->getOutput()->showFatalError( wfMsg( 'cannotundelete' ) );
1403                 }
1404                 return false;
1405         }
1406 }